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Most sensors are socketed and can be replaced if they are defective or the shelf life has expired. In this case, the air-Q gives a hint in the app or on the device.
Depending on the version, the air-Q has one or more free slots for additional sensors. For example, it is possible to add a sensor for ultrafine dust or methane. All currently available additional sensors can be found at https://shop.air-q.com/